How to enable short tags in php?

The short tag is only used to output variable or expression. The general usage is

<?=$a?>
<?=(表达式)?>

is equivalent to
echo $a?>

The first is according to the standard writing method of PHP.

The way to open the short tag is as follows

The second is to modify the value of short_open_tag in the config file(php.ini) to on.

If set to Off, PHP files similar to this form cannot be parsed normally:

<?
phpinfo()
?>

but can only parse

<?php
phpinfo()
?>

This form of php file
So if we want php to support short tags, we need to set short_open_tag

to On.

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